--- /dev/null
+/* List a tar archive.
+ Copyright (C) 1988, 1992 Free Software Foundation
+
+This file is part of GNU Tar.
+
+GNU Tar is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Tar is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Tar; see the file COPYING. If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+/*
+ * List a tar archive.
+ *
+ * Also includes support routines for reading a tar archive.
+ *
+ * this version written 26 Aug 1985 by John Gilmore (ihnp4!hoptoad!gnu).
+ */
+
+#include <stdio.h>
+#include <ctype.h>
+#include <sys/types.h>
+#include <errno.h>
+#ifndef STDC_HEADERS
+extern int errno;
+#endif
+#include <time.h>
+
+#ifdef BSD42
+#include <sys/file.h>
+#else
+#ifndef V7
+#include <fcntl.h>
+#endif
+#endif
+
+#define isodigit(c) ( ((c) >= '0') && ((c) <= '7') )
+
+#include "tar.h"
+#include "port.h"
+
+extern FILE *msg_file;
+
+long from_oct(); /* Decode octal number */
+void demode(); /* Print file mode */
+
+union record *head; /* Points to current archive header */
+struct stat hstat; /* Stat struct corresponding */
+int head_standard; /* Tape header is in ANSI format */
+
+int check_exclude();
+void close_archive();
+void decode_header();
+int findgid();
+int finduid();
+void name_gather();
+int name_match();
+void names_notfound();
+void open_archive();
+void print_header();
+int read_header();
+void saverec();
+void skip_file();
+void skip_extended_headers();
+
+extern char *quote_copy_string();
+
+
+/*
+ * Main loop for reading an archive.
+ */
+void
+read_and(do_something)
+ void (*do_something)();
+{
+ int status = 3; /* Initial status at start of archive */
+ int prev_status;
+ extern time_t new_time;
+ char save_linkflag;
+
+ name_gather(); /* Gather all the names */
+ open_archive(1); /* Open for reading */
+
+ for(;;) {
+ prev_status = status;
+ status = read_header();
+ switch (status) {
+
+ case 1: /* Valid header */
+ /* We should decode next field (mode) first... */
+ /* Ensure incoming names are null terminated. */
+ head->header.name[NAMSIZ-1] = '\0';
+
+ if ( !name_match(head->header.name)
+ || (f_new_files && hstat.st_mtime<new_time)
+ || (f_exclude && check_exclude(head->header.name))) {
+
+ int isextended = 0;
+
+ if( head->header.linkflag==LF_VOLHDR
+ || head->header.linkflag==LF_MULTIVOL
+ || head->header.linkflag==LF_NAMES) {
+ (*do_something)();
+ continue;
+ }
+ if (f_show_omitted_dirs
+ && head->header.linkflag == LF_DIR)
+ msg ("Omitting %s\n", head->header.name);
+ /* Skip past it in the archive */
+ if (head->header.isextended)
+ isextended = 1;
+ save_linkflag = head->header.linkflag;
+ userec(head);
+ if (isextended) {
+/* register union record *exhdr;
+
+ for (;;) {
+ exhdr = findrec();
+ if (!exhdr->ext_hdr.isextended) {
+ userec(exhdr);
+ break;
+ }
+ }
+ userec(exhdr);*/
+ skip_extended_headers();
+ }
+ /* Skip to the next header on the archive */
+ if(save_linkflag != LF_DIR)
+ skip_file((long)hstat.st_size);
+ continue;
+
+ }
+
+ (*do_something)();
+ continue;
+
+ /*
+ * If the previous header was good, tell them
+ * that we are skipping bad ones.
+ */
+ case 0: /* Invalid header */
+ userec(head);
+ switch (prev_status) {
+ case 3: /* Error on first record */
+ msg("Hmm, this doesn't look like a tar archive.");
+ /* FALL THRU */
+ case 2: /* Error after record of zeroes */
+ case 1: /* Error after header rec */
+ msg("Skipping to next file header...");
+ case 0: /* Error after error */
+ break;
+ }
+ continue;
+
+ case 2: /* Record of zeroes */
+ userec(head);
+ status = prev_status; /* If error after 0's */
+ if (f_ignorez)
+ continue;
+ /* FALL THRU */
+ case EOF: /* End of archive */
+ break;
+ }
+ break;
+ };
+
+ close_archive();
+ names_notfound(); /* Print names not found */
+}
+
+
+/*
+ * Print a header record, based on tar options.
+ */
+void
+list_archive()
+{
+ extern char *save_name;
+ int isextended = 0; /* Flag to remember if head is extended */
+
+ /* Save the record */
+ saverec(&head);
+
+ /* Print the header record */
+ if (f_verbose) {
+ if (f_verbose > 1)
+ decode_header(head, &hstat, &head_standard, 0);
+ print_header();
+ }
+
+ if(f_gnudump && head->header.linkflag==LF_DUMPDIR) {
+ size_t size, written, check;
+ char *data;
+ extern long save_totsize;
+ extern long save_sizeleft;
+
+ userec(head);
+ if(f_multivol) {
+ save_name = head->header.name;
+ save_totsize=hstat.st_size;
+ }
+ for(size = hstat.st_size;size>0;size-=written) {
+ if(f_multivol)
+ save_sizeleft=size;
+ data = findrec()->charptr;
+ if(data==NULL) {
+ msg("EOF in archive file?");
+ break;
+ }
+ written = endofrecs()->charptr - data;
+ if(written>size)
+ written=size;
+ errno=0;
+ check=fwrite(data,sizeof(char), written, msg_file);
+ userec((union record *)(data+written - 1));
+ if(check!=written) {
+ msg_perror("only wrote %ld of %ld bytes to file %s",check, written,head->header.name);
+ skip_file((long)(size)-written);
+ break;
+ }
+ }
+ if(f_multivol)
+ save_name = 0;
+ saverec((union record **) 0); /* Unsave it */
+ fputc('\n',msg_file);
+ fflush(msg_file);
+ return;
+
+ }
+ saverec((union record **) 0); /* Unsave it */
+ /* Check to see if we have an extended header to skip over also */
+ if (head->header.isextended)
+ isextended = 1;
+
+ /* Skip past the header in the archive */
+ userec(head);
+
+ /*
+ * If we needed to skip any extended headers, do so now, by
+ * reading extended headers and skipping past them in the
+ * archive.
+ */
+ if (isextended) {
+/* register union record *exhdr;
+
+ for (;;) {
+ exhdr = findrec();
+
+ if (!exhdr->ext_hdr.isextended) {
+ userec(exhdr);
+ break;
+ }
+ userec(exhdr);
+ }*/
+ skip_extended_headers();
+ }
+
+ if(f_multivol)
+ save_name=head->header.name;
+ /* Skip to the next header on the archive */
+
+ skip_file((long) hstat.st_size);
+
+ if(f_multivol)
+ save_name = 0;
+}
+
+
+/*
+ * Read a record that's supposed to be a header record.
+ * Return its address in "head", and if it is good, the file's
+ * size in hstat.st_size.
+ *
+ * Return 1 for success, 0 if the checksum is bad, EOF on eof,
+ * 2 for a record full of zeros (EOF marker).
+ *
+ * You must always userec(head) to skip past the header which this
+ * routine reads.
+ */
+int
+read_header()
+{
+ register int i;
+ register long sum, recsum;
+ register char *p;
+ register union record *header;
+ long from_oct();
+
+ header = findrec();
+ head = header; /* This is our current header */
+ if (NULL == header)
+ return EOF;
+
+ recsum = from_oct(8, header->header.chksum);
+
+ sum = 0;
+ p = header->charptr;
+ for (i = sizeof(*header); --i >= 0;) {
+ /*
+ * We can't use unsigned char here because of old compilers,
+ * e.g. V7.
+ */
+ sum += 0xFF & *p++;
+ }
+
+ /* Adjust checksum to count the "chksum" field as blanks. */
+ for (i = sizeof(header->header.chksum); --i >= 0;)
+ sum -= 0xFF & header->header.chksum[i];
+ sum += ' '* sizeof header->header.chksum;
+
+ if (sum == recsum) {
+ /*
+ * Good record. Decode file size and return.
+ */
+ if (header->header.linkflag == LF_LINK)
+ hstat.st_size = 0; /* Links 0 size on tape */
+ else
+ hstat.st_size = from_oct(1+12, header->header.size);
+ return 1;
+ }
+
+ if (sum == 8*' ') {
+ /*
+ * This is a zeroed record...whole record is 0's except
+ * for the 8 blanks we faked for the checksum field.
+ */
+ return 2;
+ }
+
+ return 0;
+}
+
+
+/*
+ * Decode things from a file header record into a "struct stat".
+ * Also set "*stdp" to !=0 or ==0 depending whether header record is "Unix
+ * Standard" tar format or regular old tar format.
+ *
+ * read_header() has already decoded the checksum and length, so we don't.
+ *
+ * If wantug != 0, we want the uid/group info decoded from Unix Standard
+ * tapes (for extraction). If == 0, we are just printing anyway, so save time.
+ *
+ * decode_header should NOT be called twice for the same record, since the
+ * two calls might use different "wantug" values and thus might end up with
+ * different uid/gid for the two calls. If anybody wants the uid/gid they
+ * should decode it first, and other callers should decode it without uid/gid
+ * before calling a routine, e.g. print_header, that assumes decoded data.
+ */
+void
+decode_header(header, st, stdp, wantug)
+ register union record *header;
+ register struct stat *st;
+ int *stdp;
+ int wantug;
+{
+
+ long from_oct();
+
+ st->st_mode = from_oct(8, header->header.mode);
+ st->st_mtime = from_oct(1+12, header->header.mtime);
+ if(f_gnudump) {
+ st->st_atime = from_oct(1+12, header->header.atime);
+ st->st_ctime = from_oct(1+12, header->header.ctime);
+ }
+
+ /* Older versions of GNU tar wrote "ustar \0" instead of
+ "ustar\0""00" for the magic/version field. Recognize both. */
+ if (0==strncmp(header->header.magic, TMAGIC, 5)) {
+ /* Unix Standard tar archive */
+ *stdp = 1;
+ if (wantug) {
+#ifdef NONAMES
+ st->st_uid = from_oct(8, header->header.uid);
+ st->st_gid = from_oct(8, header->header.gid);
+#else
+ st->st_uid = finduid(header->header.uname);
+ st->st_gid = findgid(header->header.gname);
+#endif
+ }
+#if defined(S_IFBLK) || defined(S_IFCHR)
+ switch (header->header.linkflag) {
+ case LF_BLK: case LF_CHR:
+ st->st_rdev = makedev(from_oct(8, header->header.devmajor),
+ from_oct(8, header->header.devminor));
+ }
+#endif
+ } else {
+ /* Old fashioned tar archive */
+ *stdp = 0;
+ st->st_uid = from_oct(8, header->header.uid);
+ st->st_gid = from_oct(8, header->header.gid);
+ st->st_rdev = 0;
+ }
+}
+
+
+/*
+ * Quick and dirty octal conversion.
+ *
+ * Result is -1 if the field is invalid (all blank, or nonoctal).
+ */
+long
+from_oct(digs, where)
+ register int digs;
+ register char *where;
+{
+ register long value;
+
+ while (isspace(*where)) { /* Skip spaces */
+ where++;
+ if (--digs <= 0)
+ return -1; /* All blank field */
+ }
+ value = 0;
+ while (digs > 0 && isodigit(*where)) { /* Scan til nonoctal */
+ value = (value << 3) | (*where++ - '0');
+ --digs;
+ }
+
+ if (digs > 0 && *where && !isspace(*where))
+ return -1; /* Ended on non-space/nul */
+
+ return value;
+}
+
+
+/*
+ * Actually print it.
+ *
+ * Plain and fancy file header block logging.
+ * Non-verbose just prints the name, e.g. for "tar t" or "tar x".
+ * This should just contain file names, so it can be fed back into tar
+ * with xargs or the "-T" option. The verbose option can give a bunch
+ * of info, one line per file. I doubt anybody tries to parse its
+ * format, or if they do, they shouldn't. Unix tar is pretty random here
+ * anyway.
+ *
+ * Note that print_header uses the globals <head>, <hstat>, and
+ * <head_standard>, which must be set up in advance. This is not very clean
+ * and should be cleaned up. FIXME.
+ */
+#define UGSWIDTH 18 /* min width of User, group, size */
+/* UGSWIDTH of 18 means that with user and group names <= 8 chars the columns
+ never shift during the listing. */
+#define DATEWIDTH 19 /* Last mod date */
+static int ugswidth = UGSWIDTH; /* Max width encountered so far */
+
+void
+print_header()
+{
+ char modes[11];
+ char *timestamp;
+ char uform[11], gform[11]; /* These hold formatted ints */
+ char *user, *group;
+ char size[24]; /* Holds a formatted long or maj, min */
+ time_t longie; /* To make ctime() call portable */
+ int pad;
+ char *name;
+ extern long baserec;
+
+ if(f_sayblock)
+ fprintf(msg_file,"rec %10d: ",baserec + (ar_record - ar_block));
+ /* annofile(msg_file, (char *)NULL); */
+
+ if (f_verbose <= 1) {
+ /* Just the fax, mam. */
+ char *name;
+
+ name=quote_copy_string(head->header.name);
+ if(name==0)
+ name=head->header.name;
+ fprintf(msg_file, "%s\n", name);
+ if(name!=head->header.name)
+ free(name);
+ } else {
+ /* File type and modes */
+ modes[0] = '?';
+ switch (head->header.linkflag) {
+ case LF_VOLHDR:
+ modes[0]='V';
+ break;
+
+ case LF_MULTIVOL:
+ modes[0]='M';
+ break;
+
+ case LF_NAMES:
+ modes[0]='N';
+ break;
+
+ case LF_SPARSE:
+ case LF_NORMAL:
+ case LF_OLDNORMAL:
+ case LF_LINK:
+ modes[0] = '-';
+ if ('/' == head->header.name[strlen(head->header.name)-1])
+ modes[0] = 'd';
+ break;
+ case LF_DUMPDIR:modes[0] = 'd'; break;
+ case LF_DIR: modes[0] = 'd'; break;
+ case LF_SYMLINK:modes[0] = 'l'; break;
+ case LF_BLK: modes[0] = 'b'; break;
+ case LF_CHR: modes[0] = 'c'; break;
+ case LF_FIFO: modes[0] = 'p'; break;
+ case LF_CONTIG: modes[0] = 'C'; break;
+ }
+
+ demode((unsigned)hstat.st_mode, modes+1);
+
+ /* Timestamp */
+ longie = hstat.st_mtime;
+ timestamp = ctime(&longie);
+ timestamp[16] = '\0';
+ timestamp[24] = '\0';
+
+ /* User and group names */
+ if (*head->header.uname && head_standard) {
+ user = head->header.uname;
+ } else {
+ user = uform;
+ (void)sprintf(uform, "%d", (int)hstat.st_uid);
+ }
+ if (*head->header.gname && head_standard) {
+ group = head->header.gname;
+ } else {
+ group = gform;
+ (void)sprintf(gform, "%d", (int)hstat.st_gid);
+ }
+
+ /* Format the file size or major/minor device numbers */
+ switch (head->header.linkflag) {
+#if defined(S_IFBLK) || defined(S_IFCHR)
+ case LF_CHR:
+ case LF_BLK:
+ (void)sprintf(size, "%d,%d",
+ major(hstat.st_rdev),
+ minor(hstat.st_rdev));
+ break;
+#endif
+ case LF_SPARSE:
+ (void)sprintf(size, "%ld",
+ from_oct(1+12, head->header.realsize));
+ break;
+ default:
+ (void)sprintf(size, "%ld", (long)hstat.st_size);
+ }
+
+ /* Figure out padding and print the whole line. */
+ pad = strlen(user) + strlen(group) + strlen(size) + 1;
+ if (pad > ugswidth) ugswidth = pad;
+
+ name = quote_copy_string(head->header.name);
+ if(!name)
+ name=head->header.name;
+ fprintf(msg_file, "%s %s/%s %*s%s %s %s %.*s",
+ modes,
+ user,
+ group,
+ ugswidth - pad,
+ "",
+ size,
+ timestamp+4, timestamp+20,
+ sizeof(head->header.name),
+ name);
+
+ if(name!=head->header.name)
+ free(name);
+ switch (head->header.linkflag) {
+ case LF_SYMLINK:
+ name=quote_copy_string(head->header.linkname);
+ if(!name)
+ name=head->header.linkname;
+ fprintf(msg_file, " -> %s\n", name);
+ if(name!=head->header.linkname)
+ free(name);
+ break;
+
+ case LF_LINK:
+ name=quote_copy_string(head->header.linkname);
+ if(!name)
+ name=head->header.linkname;
+ fprintf(msg_file, " link to %s\n", head->header.linkname);
+ if(name!=head->header.linkname)
+ free(name);
+ break;
+
+ default:
+ fprintf(msg_file, " unknown file type '%c'\n",
+ head->header.linkflag);
+ break;
+
+ case LF_OLDNORMAL:
+ case LF_NORMAL:
+ case LF_SPARSE:
+ case LF_CHR:
+ case LF_BLK:
+ case LF_DIR:
+ case LF_FIFO:
+ case LF_CONTIG:
+ case LF_DUMPDIR:
+ putc('\n', msg_file);
+ break;
+
+ case LF_VOLHDR:
+ fprintf(msg_file, "--Volume Header--\n");
+ break;
+
+ case LF_MULTIVOL:
+ fprintf(msg_file, "--Continued at byte %ld--\n",from_oct(1+12,head->header.offset));
+ break;
+
+ case LF_NAMES:
+ fprintf(msg_file,"--Mangled file names--\n");
+ break;
+ }
+ }
+ fflush(msg_file);
+}
+
+/*
+ * Print a similar line when we make a directory automatically.
+ */
+void
+pr_mkdir(pathname, length, mode)
+ char *pathname;
+ int length;
+ int mode;
+{
+ char modes[11];
+ char *name;
+ extern long baserec;
+
+ if (f_verbose > 1) {
+ /* File type and modes */
+ modes[0] = 'd';
+ demode((unsigned)mode, modes+1);
+
+ if(f_sayblock)
+ fprintf(msg_file,"rec %10d: ",baserec + (ar_record - ar_block));
+ /* annofile(msg_file, (char *)NULL); */
+ name=quote_copy_string(pathname);
+ if(!name)
+ name=pathname;
+ fprintf(msg_file, "%s %*s %.*s\n",
+ modes,
+ ugswidth+DATEWIDTH,
+ "Creating directory:",
+ length,
+ pathname);
+ if(name!=pathname)
+ free(name);
+ }
+}
+
+
+/*
+ * Skip over <size> bytes of data in records in the archive.
+ */
+void
+skip_file(size)
+ register long size;
+{
+ union record *x;
+ extern long save_totsize;
+ extern long save_sizeleft;
+
+ if(f_multivol) {
+ save_totsize=size;
+ save_sizeleft=size;
+ }
+
+ while (size > 0) {
+ x = findrec();
+ if (x == NULL) { /* Check it... */
+ msg("Unexpected EOF on archive file");
+ exit(EX_BADARCH);
+ }
+ userec(x);
+ size -= RECORDSIZE;
+ if(f_multivol)
+ save_sizeleft-=RECORDSIZE;
+ }
+}
+
+void
+skip_extended_headers()
+{
+ register union record *exhdr;
+
+ for (;;) {
+ exhdr = findrec();
+ if (!exhdr->ext_hdr.isextended) {
+ userec(exhdr);
+ break;
+ }
+ userec (exhdr);
+ }
+}
+
+/*
+ * Decode the mode string from a stat entry into a 9-char string and a null.
+ */
+void
+demode(mode, string)
+ register unsigned mode;
+ register char *string;
+{
+ register unsigned mask;
+ register char *rwx = "rwxrwxrwx";
+
+ for (mask = 0400; mask != 0; mask >>= 1) {
+ if (mode & mask)
+ *string++ = *rwx++;
+ else {
+ *string++ = '-';
+ rwx++;
+ }
+ }
+
+ if (mode & S_ISUID)
+ if (string[-7] == 'x')
+ string[-7] = 's';
+ else
+ string[-7] = 'S';
+ if (mode & S_ISGID)
+ if (string[-4] == 'x')
+ string[-4] = 's';
+ else
+ string[-4] = 'S';
+ if (mode & S_ISVTX)
+ if (string[-1] == 'x')
+ string[-1] = 't';
+ else
+ string[-1] = 'T';
+ *string = '\0';
+}
projects / chaz / tar / commitdiff
